chore: snapshot workflow migration progress

backend/app/api/routers/products.py

@@ -16,6 +16,11 @@ from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.orm import selectinload, joinedload
 
 from app.config import settings
+from app.core.render_paths import (
+    resolve_result_path,
+    resolve_public_asset_url,
+    result_path_to_public_url,
+)
 from app.database import get_db
 from app.models.cad_file import CadFile, ProcessingStatus
 from app.models.material import Material
@@ -829,24 +834,12 @@ VIDEO_EXTENSIONS = {".mp4", ".webm", ".avi", ".mov"}
 
 def _result_path_to_url(result_path: str) -> str | None:
     """Convert an internal result_path to a servable static URL."""
-    # Flamenco / shared renders: /shared/renders/X/file.jpg → /renders/X/file.jpg
-    if "/renders/" in result_path:
-        idx = result_path.index("/renders/")
-        return result_path[idx:]
-    # Celery renders stored as thumbnails: /app/uploads/thumbnails/X.png → /thumbnails/X.png
-    if "/thumbnails/" in result_path:
-        idx = result_path.index("/thumbnails/")
-        return result_path[idx:]
-    return None
+    return result_path_to_public_url(result_path, require_exists=False)
 
 
 def _resolve_disk_path(url: str) -> Path | None:
     """Given a servable URL like /renders/X/file.jpg, resolve to disk path."""
-    if url.startswith("/renders/"):
-        return Path(settings.upload_dir) / "renders" / url[len("/renders/"):]
-    if url.startswith("/thumbnails/"):
-        return Path(settings.upload_dir) / "thumbnails" / url[len("/thumbnails/"):]
-    return None
+    return resolve_public_asset_url(url)
 
 
 @router.get("/{product_id}/renders")
@@ -983,9 +976,8 @@ async def download_product_renders(
         raise HTTPException(404, detail="No completed renders found for the selected lines")
 
     def _resolve_path(p: str) -> str:
-        if p.startswith("/shared/"):
-            return settings.upload_dir + p[len("/shared"):]
-        return p
+        resolved = resolve_result_path(p)
+        return str(resolved) if resolved is not None else p
 
     def _safe(s: str) -> str:
         return re.sub(r"[^\w\-.]", "_", s).strip("_")
@@ -1147,4 +1139,3 @@ async def delete_render_position(
         raise HTTPException(404, detail="Render position not found")
     await db.delete(pos)
     await db.commit()
-